Piezoelectric properties of Ca-modified Pb0.6Bi0.4(Ti0.75Zn0.15Fe0.10)O3 ceramics

Perovskite-structured Pb0.6Bi0.4(Ti0.75Zn0.15Fe0.1)O3 ceramics was reported with high Curie temperature TC of 705 °C and tetragonality of c/a = 1.10, promising for high temperature applications with large piezoelectric anisotropy. In this paper, it was experimentally demonstrated to ease poling processing and enhance piezoelectricity through substituting lead with calcium of Pb0.6−xCaxBi0.4(Ti0.75Zn0.15Fe0.1)O3. For the x = 0.18 sample, electromechanical coupling factor ratio of kt/kp → ∞, dielectric constant of 380, piezoelectric coefficient d33 of 80 pC/N, mechanical quality factor Qm of 50 and Curie point TC of 237 °C were obtained, which exhibits better piezoelectric performance than the (Pb0.76Ca0.24)(Ti0.96(Co0.5W0.5)0.04)O3. The enhanced piezoelectric response was analyzed with relation to the reduction of tetragonality and Curie temperature.